ITPUB

Jan 3, 2025 · Databases

Why ClickHouse Sharded Table Queries Return Inconsistent Row Counts—and How to Fix It

A ClickHouse cluster showed wildly varying row counts when querying sharded tables, while local tables behaved correctly; the article analyses the root cause in the cluster and table configuration, explains why the inconsistency occurs, and provides a step‑by‑step fix by switching to replicated tables.